| 摘要 |
PURPOSE:The titled mold for molding, obtained by working carbon as a base material into a die by vapor deposition of beta-SiC, and coating the surface with A-SiC or alpha-SiC, by vapor deposition, and capable of molding with a high accuracy and direct molding of glass lenses. CONSTITUTION:A mold for direct press molding obtained by manufacturing a nonspherical mold previously from carbon as a base material, applying beta-SiC onto the mole by the chemical or chemical vapor deposition method, reworking the resultant mold into a nonspherical surface to form a dense die of lens shape, coating the resultant film of beta-SiC easily reactive with glass containing much alkali or Ba with A-SiC or alpha-SiC of uniform thickness by the chemical or physical vapor deposition method to form a nonspherical surface slightly reactive with the above-mentioned glass, and capable of direct press molding optical glass lenses capable of focusing good images.
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